IRC log of #zope for Thursday, 2012-12-27

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mgedminploufplouf, that error indicates a mismatch between Five and zope.configuration versions13:20
ploufploufyes thank you, y eventually get it13:20
mgedmin"y"?13:20
ploufploufI13:21
mgedminheh, ok13:21
ploufploufI was trying to install zope with pip, and dependancies when absolutely not correct13:22
mgedminhave you found a solution?13:25
mgedmin(which would be downgrading zope.configuration to 3.8.1, probably)13:26
ploufploufyes it's ok now13:30
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elonHow does the Zope ORM, ZODB, manage memory? Suppose I want to store and/or load an instance of class A, that contains an instance of class B, and another instance of class A, which contains an instance of class A and one of class B(about a hundred layers deep, for example). If I load the top-object, will all the sub-objects be loaded into memory, or only as they are needed(lazy)?18:15
betabugelon: first of all, ZODB is *not* an ORM18:17
betabugsecond, things are loaded into memory only as needed18:17
betabuga certain amount of objects are cached in memory (you can adjust the size of that cache)18:18
elonbetabug: Sorry for that, I've been working with SQLAlchemy all day. I know that it isn't since it doesn't map objects in a relational database18:19
betabugand in the control panel you can see the state of things for that cache18:19
elonbetabug: I'm planning on using ZODB standalone18:19
betabugthen you won't have that control panel, but the same cache thing applies18:20
betabugand I guess there is an API somewhere to get to those numbers if you have to18:20
elonbetabug: So... I can make and use large objects, without having memory issues?18:20
betabughaha, you can't generalize these things18:21
betabugusually people don't have memory issues, but if you do enough stupid things (unnecessarily loading objects) and if you have enough objects, things can slow down18:21
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betabuge.g. in Zope there are 2 methods to loop over the contents of a Folder: one enumerates the ids (strings) of the children, the other enumerates the objects18:23
elonbetabug: I understand that. Thanks for your help.18:23
betabugso you don't want to enumerate the objects if you don't need to, getting the strings is cheaper18:23
betabugnp, you're welcome18:23
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